A5013884845- Microstructure and mechanical properties
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Ion-surface interactions and analysis
- Fusion materials and technologies
- Copper Interconnects and Reliability
- Intermetallics and Advanced Alloy Properties
- Aluminum Alloy Microstructure Properties
- Nuclear Materials and Properties
- Advanced materials and composites
- nanoparticles nucleation surface interactions
- Additive Manufacturing Materials and Processes
- Nuclear materials and radiation effects
- Semiconductor materials and devices
- Advanced ceramic materials synthesis
- High Temperature Alloys and Creep
- Advanced Materials Characterization Techniques
- Semiconductor materials and interfaces
- Silicon and Solar Cell Technologies
- Magnesium Alloys: Properties and Applications
- High Entropy Alloys Studies
- Solidification and crystal growth phenomena
- Advanced Surface Polishing Techniques
- Electronic and Structural Properties of Oxides
- Surface and Thin Film Phenomena
University of Michigan
2016-2025
Manipal Academy of Higher Education
2025
University of Lucknow
2025
Aligarh Muslim University
2024
Vellore Institute of Technology University
2024
Research Design And Standards Organization
2022
Academy of Scientific and Innovative Research
2022
Michigan United
2020
Arizona State University
2019
Texas A&M University
2019
Designing a material from the atomic level to achieve tailored response in extreme conditions is grand challenge materials research. Nanostructured metals and composites provide path this goal because they contain interfaces that attract, absorb annihilate point line defects. These recover control defects produced subjected extremes of displacement damage, impurity implantation, stress temperature. Controlling radiation-induced-defects via shown be key factor reducing damage imparting...
This article reviews recent basic research on two classes of twins: growth twins and deformation twins. We focus primarily studies that aim to understand, via experiments, modeling, or both, the causes effects twinning at a fundamental level. anticipate that, by providing broad perspective latest advances in twinning, this review will help set stage for designing new metallic materials with unprecedented combinations mechanical physical properties.
A novel interface engineering strategy is proposed to simultaneously achieve superior irradiation tolerance, high strength, and thermal stability in bulk nanolayered composites of a model face-centered-cubic (Cu)/body-centered-cubic (Nb) system. By synthesizing Cu-Nb containing interfaces with controlled sink efficiencies, material designed which nearly all irradiation-induced defects are annihilated. As service our authors readers, this journal provides supporting information supplied by...
The mechanical behavior of nanolaminates is dominated by interfaces that act as sources, barriers, and preferred sites for storage dynamic recovery glide dislocations. In this article, the deformation mechanisms a variety metal-based are reviewed with emphasis on unusual properties such ultra-high flow strength without loss plastic deformability.
Abstract A breakdown from the dislocation-pile-up-based Hall-Petch model is typically observed in metallic multilayers when layer thickness (one half of bilayer period) order a few tens nanometres. The multilayer strength, however, continues to increase with decreasing based on glide single dislocations developed interpret increasing strength multilayered metals no longer applicable. built hypothesis that plastic flow initially confined one and occurs by motion ‘hairpin’ dislocation loops...
In this work, micropillar compression testing has been used to obtain stress-strain curves for sputter-deposited Cu–Nb nanolaminate composites with nominal bilayer thickness of 10nm. addition the extremely high flow strength 2.4GPa, 5nm Cu∕5nm Nb exhibits significant ductility, in excess 25% true strain.
We have investigated the thermal stability of sputter-deposited Cu thin films with a high density nanoscale growth twins by using high-vacuum annealing up to 800 °C for 1 h. Average twin lamella thickness gradually increased from approximately 4 nm as-deposited slightly less than 20 after at °C. The average columnar grain size, on other hand, rapidly 50 500 nm. In spite an order magnitude increase in annealed retained hardness 2.2 GPa, reduced 3.5 GPa state. is interpreted terms thermally...
Bulk Cu foils have been synthesized via magnetron sputtering with an average twin spacing of 5nm. Twin interfaces are {111} type and normal to the growth direction. Growth twins such high density preferred orientation never observed in elemental metals. These exhibited tensile strengths 1.2GPa, a factor 3 higher than that reported earlier for nanocrystalline Cu, uniform elongation 1%–2%, ductile dimple fracture surfaces. This work provides route synthesis ultrahigh-strength, pure metals...
Magnetron-sputter-deposited austenitic 330 stainless steel (330 SS) films, several microns thick, were found to have a hardness ∼6.5 GPa, about an order of magnitude higher than bulk SS. High-resolution transmission electron microscopy revealed that sputtered SS coatings are heavily twinned on {111} with nanometer scale twin spacing. Molecular dynamics simulations show that, in the regime where plasticity is controlled by motion single rather pile-ups dislocations, boundaries very strong...
The key to perfect radiation endurance is recovery. Since surfaces are sinks for defects, a porous material with high surface volume ratio has the potential be extremely tolerant, provided it morphologically stable in environment. Experiments and computer simulations on nanoscale gold foams reported here show existence of window parameter space where tolerant. We analyze these results terms model irradiation response that quantitatively locates such appears consequence combined effect two...
We report on the synthesis of epitaxial (single-crystal-like), nanotwinned Cu films via magnetron sputtering. Increasing deposition rate from 1 to 4 nm/s decreased average twin lamellae spacing 16 7 nm. These exhibit significantly higher ratio hardness room temperature electrical resistivity than columnar grain (nanocrystalline), textured, films.
Metallic multilayers, composed of alternating layers soft metals, are shown to possess ultra-high strengths when the bilayer periods on order a few nanometers. In fact, strength materials may be within factor two three theoretical limit. The dependence period for these multilayers synthesized by vapor deposition techniques is reviewed. It that deformation mechanisms operate in micron-scale not applicable at nanometer length scales. Dislocation-based models developed predict transition from...